Tripping mechanism.



W. SCOTT, DEGD. 1. an D. J, sc oT'r, nxnou'Tons.

TRIPPING .MBOHAN'ISM. APPLICATION FILED MAB. 14, 1906.

Patented Jan. 10, 1911.

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TRIPPING MEGHANISM.

APPLICATION FILED MAB-.14. 1906.

Patented Jan. 10, 1911.

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WALTER SCOTT, OF PLAINFELD, NEVI JERSEY; ISABELLA SCOTT AND DAVID JOHNSCOTT EXECUTORS OF SAID WALTER SCOTT, DECEASED.

TRIPPING MECHANISM.

To all whom i may concern:

Be it known that- I, VALTER SCOTT, a citizen of the United States ofAmerica, and a residentof Plainfield, Union county, New Jersey, haveinvented certain new and useful Improvements in Tripping Mechanisms, ofwhich the following is a specification.

rlhe present invention relates generally to printing machines, and hasmore particularly reference to tripping mechanism connected therewith.

ln printing machines, whether rotary or fiat bed such as one, two orthree revolution printing machines, stop cylinder and oscillatingprinting machines, it is customary to use a trip for the impressioncylinder for moving it out of contact with the form, generally put intoaction at the will of the op` erator by means of foot or hand power orautomatically at certain periods, thereby preventing the cylinder fromtaking an impression on the form. When the cylinder is tripped for aconsiderable period and consequently the supply of ink is not beingused, the ink accumulates on the inkiiig rolls and on the form.

rThe object of the presenty invention is the production of means wherebywhen the machine is tripped for a considerable period, the supply of inkmay be cut off.

'llo this end the invention comprises the features of construction andcombination of parts as will more fully hereinafter appear.

ln the present instance the invention is shown applied to a tworevolution printing machine; that a printing machine in which theimpression cylinder revolves twice to each sheet printed. Tn suchmachines means are usually employed to raise the cylinder during thereturn stroke of the bed or once to every two revolutions of thecylinder or other ratio according to the design of the machine. For thepurpose of certain of the claims the precise means for tripping thecylinder are of course immaterial as any suitable means may of course beused for effecting this.

In the drawings, the invention has been embodied in several preferredforms, but changes in construction may be made without departing fromthe spirit of the invention.

In the said drawings: Figure l is a side elevation, with parts brokenaway showing a printing machine of the character indi- Speccaton ofLetters Patent.

Application filed March 14, 1306.

Patented J an. 10, 1911.

Serial No. 305,989.

cated with the ink tripping means applied. Fig. 2 is a plan view ofparts shown in l. F 23 shows a side elevation of aA modification showing'the driving means for the fountain roll tripped. Fig. 4 is view similarto Fig. 3 with the fountain roll untripped. Fig. 5 is a plan detail viewof parts shown in Figs. 3 and et.

Similar characters of reference indicate corresponding parts in thedifferentviews.

l indicates a framework of any suitable construction for properlysupporting the parts comprising' the machine.

2 indicates the impression cylinder carried by the journal 3. rThisjournal 3 is mounted in sliding frames or standards 4t, one on each sideof the machine, but only one of which is seen.

The form carrying means in the present instance consist of thereciprocating bed 5 on which is mounted the plate or type or other meansconstituting the form (S.

T and S indicate two groups of distrihir ting` rolls such as are usuallyemployed in machines of this character and adjacent to the group ofdistributing rolls 7 is a fountain 9 in which is located a fountain roll10. rThis fountain roll may be of any usual or suitable construction andmay either rotate continuously or intermittently, or may be operated inany other way found useful. The ink is transferred, as is customary,from the fountain roll to the distributing rolls or other distributingsurface by means of the ductor roll ll pivoted at- 12 and operated inthe usual manner from the cam lf3 mounted on the shaft lst and makingone revolution to each impression or to each complete reciprocation ofthe bed. The motion of this cam is transferred to the ductor roll bymeans of the friction roll l5 carried by the lever l@ connected with thelower end of the ductor roll by means of the rodr 17. On each returnstroke of the bed the standards et are moved up and out of the way ofthe form while on the forward movement of the bed the impressioncylinder is moved down so as to be in contact with theysaid form as itpasses under the same.

Any suitable means may be employed to move the impression cylinder upand down. Tn the present instance, however, there is mounted on thestandards #t a shaftlS connected by means of the toggle links 19 to afixed bracketl 2O on the framework. This shaft 18 is oscillated by meansof the cam 21 conveniently mounted on the shaft 14 through theinstrumentality of the rocker 22 pivoted at 23 and having a frictionroll 24 engaging with the said cam 21. This rocker further carriesanother friction roll 25 adapted to engage in the notch 2G of the lever27 whose other end is connected by means of the link 28 to the shaft 18.As the cam 21 rotates, the rocker 22 will push the lever 27 back andforth thereby oscillating the shaft 18 and raising and lowering theimpression cylinder at the proper periods. Suitable means as the spring29 is used to balance the weight of the cylinder.

Mounted on the stud 30 is a rocking and sliding cam 31 which is adaptedto lift the lever 27 when it is desired to trip the cylinder or tomaintain it in its uppermost position. In order to properly effect this,there is mounted on the cam 21 or elsewhere, a projection 32 which isadapted to act on the cam surface 33 of the cam 31. As previouslystated, this cam 31 both oscillates and slides and is provided with apin or other member 34 upon which the free end of the lever 27 rests.This pin is of such a length that it will always be in contact with thelever 27. But when it is desired not to trip the cylinder the cam ismoved sidewise so as to bring the cam surface 33 out of the plane of thepassing projection 32. vWhen this cani surface 33 however is in theplane of 32 the pin 34 tends to raise the lever 27 up so as to bring theroll 25 out of the notch 26 as shown in the drawing', whereby when thecam 21 moves the rocker 22, said roll 25 will move loosely in the slot35 of the lever 27 without operating the latter. By this means thecylinder remains in its elevated position.

The means for controlling the action of the cam 31 as shown in thepresent instance,

' are those commonly employed in the art and consist preferably of afoot treadle 36 adapted to act against the counterweight 37 whendepressed and through the lever 38 pivoted atits central portion at 39the cam 31 is moved sidewise so as to bring its surface 33 into and outof engagement with the proj ection 32. Preferably the parts are soarranged that the foot treadle can be de-' pressed atany time during theoperation o-f the machine so that at the proper moment said cam will beshifted sidewise into the path of the projection 32. This is effected bymounting on the pin 40 which is used to move the cam sidewise a spring41 which presses against a collar 42 mounted on the said pin 40 adaptedto slide into the socket 42a so that when this spring 41 is compressedby the action of the lever 38, whose two forked arms 43 bear against thesaid spring, power will be stored whereby when the projection 32 haspassed the cam 31, the

said cam will be moved sidewise into the plane of the said projection 32so that when the latter comes around on the succeeding revolution itwill encounter the cam surface 33 and tilt the cam 31. The foot pedal 36is provided with a pin 44 which moves through the slot 45 when the saidfoot treadle is depressed, and by turning the said pedal around, thesaid pin 44 will engage with the underside of the collar 47 whereby theparts will be retained in their tripped -position.

48 indicates a stop supported by the bell crank 49, mounted on the'stud50, and by the link 51 pivoted thereto and provided with two notches 52and 53 adapted to receive the pin 54 on the framework. 55 is a rodconneicted at one end to the arm 58 of the lever 38 and at its other endto the bell crank 49. `When the foot treadle is depressed the said stop48 will be moved upward, and, encountering the surface 57 of thestandards of the ductor roll, will prevent the latter from coming incontact with the fountain roll while the iin-pression cylinder remainsin its tripped position.

It will be understood from the foregoing,

that the impression cylinder is moved periodically and automaticallyinto and out of contact with the form without stopping the supply of inkwhen out of contact with the form, and that when the operation of theautomatic means is interrupted and the impression cylinder remainstripped, the supply of ink is cut off. It is necessary, however, attimes vto operate the inking apparatus while the cylinder remainstripped. This is especially desirable before starting a run when thedistributing rollers and the form must be linked up. Tt is for thisreason that the link 51 is provided with the two notches 52 and lVhenthe pin 54 is in the notch 52 as shown in Fig. 1, the supply of ink willbe stopped when the foot treadle is depressed. But when the Ipin 54 isin the notch 53 the stop 48 is moved back sofar that the surface 57 willnotbe encountered and consequently the ink supply will not be cut off.

In Figs. 3, 4 and 5 is shown a modification in which the rotation of thefountain roll is stopped when it is desired to cut off the supply ofink. Tn these figures there is mounted fast on the fountain roll shaft58 a ratchet 59. Engaging with this ratchet is a pawl 60 mounted on thesleeve 61 loose on the said fountain roll shaft. This sleeve is providedwith teeth 62 with which engage the sector 63 operated in the usualmanner by means of the rod 64 to give an intermits tently progressivemotion to the fountain roll. Mounted loosely on the fountain roll shaftis further the sleeve 66 provided with the cam surface 67. This sleeveis lalso provided with teeth 68 with which mesh the sector 69 mounted onthe stud 70. Connected to the arm 7l of this sector is the rod 72 whichcorresponds to the rod in Fig. l and which is connected up in the samemanner to the foot treadle. On the pawl is a pin T3 so that when the cam67 is moved in under the said pin 73 the rotation of the fountain rollwill cease. The rod 72 is con` neeted to the arm 7l by means of the gabhook 74 engaging the pin 7 5, and when it is desired to maintain theimpression cylinder tripped without stopping the supply of ink, the saidgab hook is lifted out of engagement with the pin 75 and the rod 72 isplaced on the lug 76. This lug` 76 is in the form of a pin normally heldin the plane of the rod 72 by means of the spring 7T; the lug is furtherprovided with a peg 7S which is capable of movement through the slot 79in the framework, and when the said lug is withdrawn and the peg 78turned into the slot 80 the lug will be out of the plane of the rod 74.

that is claimed is:

l. In a printing machine, the combination with an impression cylinder,form carrying means, and inling apparatus, means for automaticallytripping and untripping the im pression cylinder, a rod controlling theink` ino' apparatus, a lever adapted to be actuated by the operator,means operated by the said lever for interrupting the operation of theautomatic means aforesaid so as to prevent the return of the impressioncylinder into contact, connections between the lever aforesaid and therod whereby the said rod is operated simultaneously therewith to tripthe inking apparatus when the lever is operated to interrupt theoperation of the automatic means aforesaid.

Q. ,lu a printing machine, the combination with an impression cylinder,form carrying means, and inking apparatus, means for au` toinaticallytripping and untripping the im` pression cylinder', a rod controllingthe ink` ing apparatus, a lever adapted to be actuated by the operator,means operated by the said lever for interrupting the operation of theautomatic means aforesaid so as to prevent the return of the impressioncylinder into contact, connections between the lever aforesaid and therod whereby the rod is operated simultaneously therewith to trip theinking apparatus when the lever is operated to interrupt the operationof the automatic means aforesaid, and means whereby the operation of thesaid automatic means can be interrupted without tripping the operationof the inking apparatus.

8. In a printing machine, the combination with an impression cylinder,form carrying means, a fountain and fountain roll, a ductor roll, and adistributing surface7 means for automatically tripping and untrippingthe impression cylinder, a rod controlling the ductor roll, a leveradapted to be actuated by the operator, means operated by the said leverfor interrupt-ing the operation of the automatic means aforesaid so asto prevent the return of the impression cylinder into contact, andconnections between the lever aforesaid and the rod whereby the said rodis operated simultaneously therewith to prevent the ductor roll fromtransferring` ink from the fountain roll to the distributing surfacewhen the lever is operated to interrupt the operation of the automaticmeans aforesaid.

4t. In a printing machine, the combination with an impression cylinder,form carrying means, a fountain and fountain roll, a ductor roll, and adistributing surface, means for automatically tripping and untrippingthe impression cylinder, a rod controlling the ductor roll, a leveradapted to be actuated by the operator, means operated by the said leverfor interrupting the operation of the automatic means aforesaid so as toprevent the return of the impression cylinder into contact, connectionsbetween the lever aforesaid and the rod whereby the said rod is operatedsinniltaneously therewith to prevent the ductor roll from transferringinl: from the fountain roll to the distribiilting surface when the leveris operated to interrupt the operation of the automatic means aforesaid,and means whereby the operation of the said automatic means can beinterrupted without preventing the ductor roll from transferring inkfrom the fountain roll to the distribut-ing surface.

Signed at New York this 5th day of March, 1906.

VALTER SCOTT.

.Vitnesses AXEL v. BEEKEN, GEO. A. HOFFMAN.

